Mobile phone malware is malware intended to run on mobile devices, such as smartphones or PDAs.

The first mobile phone worm was written in 2004. The Cabir-A worm affects phones that use the Symbian operating system and is transmitted as a telephone game file (an SIS file). If you launch the file, a message appears on the screen and the worm is run each time you turn on the phone thereafter. Cabir-A searches for other mobile phones nearby using Bluetooth technology and sends itself to the first one it finds. Since then, a handful of malware on mobile devices has emerged. In 2009, Research In Motion (RIM) learned of Blackberry PDF vulnerability that could be exploited by hackers. If a Blackberry user tried to open a maliciously crafted PDF file, malicious code could be executed on a computer hosting the Blackberry Attachment Services. To date, we have only seen a small number of threats impacting mobile devices. This is most likely due to a heterogeneous market, with many operating systems still competing to be the market leader.